package top.lbqaq.filter;

import top.lbqaq.pojo.User;
import top.lbqaq.util.Constants;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author luoboQAQ
 * @Date 2021/11/22
 */
public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest)servletRequest;
        HttpServletResponse resp = (HttpServletResponse)servletResponse;
        User user = (User) req.getSession().getAttribute(Constants.USER_SESSION);
        if(user==null){
            req.setAttribute("error", "请登录后再访问");
            req.getRequestDispatcher("/sign-in.jsp").forward(req, resp);
        }else{
            filterChain.doFilter(req,resp);
        }
    }

    @Override
    public void destroy() {

    }
}
